Research on the Effect of Fuel Properties on Knocking Performance of Boosted Engines

Abstract

The characteristics of knocking performance under turbocharged conditions were studied. To clarify the mechanism from the viewpoint of auto ignition processes of fuel/air mixtures, fuels with independently different Research Octane Number (RON), Motor Octane Number (MON), and ethanol content were prepared. The knocking performance of these fuels, under both natural aspirated and turbocharged condition, were experimentally evaluated in a single cylinder research engine. Results show that contributions of RON and MON to knocking performance changes with engine operating conditions. For further analysis, elementary reaction calculations with reaction schemes which can simulate given RON and MON properties were performed. The mechanism was explained with characteristics of low temperature oxidation with each fuel.